HFC分解爐全無煙煤高效燃燒數(shù)值仿真研究
發(fā)布時間：2018-12-20 18:19
【摘要】：本文結(jié)合郴州市重大科技計劃項目:分解窯無煙煤高效低NOX煅燒水泥技術研究,對全無煙煤在分解爐上的應用燃燒開展研究。研究的目的在于新型干法水泥生產(chǎn)技術更加完善,向“生態(tài)環(huán)境型”邁進。利用工業(yè)分析儀和熱重分析儀對湖南郴州南方水泥廠燃用的煙煤和無煙煤的燃燒特性進行研究分析。測得煤粉的水分、灰分、揮發(fā)分、固定碳及著火溫度等這些基本數(shù)據(jù)。利用煤的著火特性指標、燃燒烈度、燃燒特性指數(shù)對幾種煙煤和無煙煤進行評價比較,獲知無煙煤的燃燒特性。有利于無煙煤在分解爐內(nèi)燃燒時,對分解爐的結(jié)構(gòu)和運行參數(shù)的優(yōu)化進行理論性指導,作出相應的結(jié)構(gòu)優(yōu)化和運行參數(shù)的優(yōu)化,以期獲得無煙煤在分解爐內(nèi)的高效燃燒。利用GAMBIT、FLUENT、ICEM等流體仿真模擬軟件,對日產(chǎn)2500t/d的分解爐建立幾何模型、進行網(wǎng)格劃分優(yōu)化和模擬研究。采用雷諾平均數(shù)值模擬中的標準k??雙方程模型模和離散相(DPM)模型對分解爐內(nèi)的氣-固兩相流進行模擬。對原型分解爐和分解爐分風分級燃燒無煙煤粉和碳酸鹽分解的耦合采用組分輸運模型結(jié)合渦耗散概念的(EDC)模型進行模擬。模擬得到原型分解爐和分解爐分風分級燃燒的氣-固兩相流的速度分布、速度分布矢量、顆粒軌跡和燃燒無煙煤粉和碳酸鹽分解的耦合的溫度分布、揮發(fā)分分布及相關物質(zhì)的組分濃度分布。對這些模擬結(jié)果進行了分析研究,與實際測試值比較,模擬結(jié)果與實際工程吻合較好。在此模擬的基礎上,對分解爐燃燒全無煙煤的高效燃燒進行模擬優(yōu)化。通過抬高生料管的位置,延后生料的噴入讓無煙煤的預熱著火有個相對燃燒穩(wěn)定區(qū);調(diào)整三次風的溫度,加快焦炭的化學動力反應速率;噴煤管改為四噴,使煤粉顆粒能更好地在分解爐內(nèi)中下部均勻分布,能使其更好換熱和燃燒。通過模擬優(yōu)化得到當生料噴煤管的高度為8.5m,三次風溫為1223K,噴煤管為四噴時,原型分解爐和分風分級燃燒分解爐為最優(yōu)模擬結(jié)果,無煙煤煤粉的燃燼率為97.21%和97.35%,碳酸鹽的分解率為92.5%和93.6%。且在原型分解爐上建立的分風分級燃燒更有利于無煙煤的燃燒、碳酸鹽的分解和降低污染物的排放,對水泥生產(chǎn)作出理論性指導。
[Abstract]:In this paper, the application and combustion of total anthracite in calciner is studied by combining with the important scientific and technological project of Chenzhou: calcination-kiln anthracite high efficiency and low NOX calcination cement technology. The purpose of the research is to perfect the new dry cement production technology and to advance to the ecological environment type. The combustion characteristics of bituminous coal and anthracite fired in Nanfang cement Plant of Chenzhou Hunan Province were studied and analyzed by means of industrial analyzer and thermogravimetric analyzer. The moisture, ash, volatilization, fixed carbon and ignition temperature of pulverized coal are measured. The combustion characteristics of anthracite were obtained by comparing and evaluating several bituminous coal and anthracite by using the ignition characteristic index, combustion intensity and combustion characteristic index of coal. When anthracite is burned in the calciner, the optimization of the structure and operation parameters of the calciner is theoretically guided, and the corresponding structural optimization and operation parameter optimization are made in order to obtain the high efficiency combustion of anthracite in the calciner. By using GAMBIT,FLUENT,ICEM and other fluid simulation software, the geometric model of 2500t/d calciner is established, and the mesh generation optimization and simulation are carried out. In the numerical simulation of Reynolds mean, the standard KG? Two-equation model and discrete phase (DPM) model are used to simulate gas-solid two-phase flow in calciner. The coupling of anthracite powder and carbonate decomposing in prototype calciner and decomposing furnace was simulated by using the component transport model combined with the (EDC) model of vortex dissipation concept. The velocity distribution of gas-solid two-phase flow, velocity distribution vector, particle trajectory and coupled temperature distribution of burning anthracite powder and carbonate decomposition were obtained by simulation. Volatilization distribution and component concentration distribution of related substances. The simulation results are compared with the actual test results, and the simulation results are in good agreement with the actual engineering results. On the basis of the simulation, the high efficiency combustion of total anthracite in calciner is simulated and optimized. By raising the position of raw material pipe, the injection of raw material can make the preheating ignition of anthracite have a relative combustion stable region, adjust the temperature of tertiary air, and accelerate the chemical dynamic reaction rate of coke. The pulverized coal particles can be distributed uniformly in the middle and lower part of the calciner and the heat transfer and combustion can be improved. When the height of raw coal injection pipe is 8.5 m, the third air temperature is 1223K, and the injection tube is four injection, the results of prototype calciner and staged combustion calciner are optimized. The burning rate of anthracite pulverized coal is 97.21% and 97.35%, and the decomposition rate of carbonate is 92.5% and 93.666% respectively. Furthermore, the combustor based on the prototype calciner is more favorable to anthracite combustion, carbonate decomposition and reduction of pollutant emissions, thus providing theoretical guidance for cement production.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ172.62
本文編號：2388351
[Abstract]:In this paper, the application and combustion of total anthracite in calciner is studied by combining with the important scientific and technological project of Chenzhou: calcination-kiln anthracite high efficiency and low NOX calcination cement technology. The purpose of the research is to perfect the new dry cement production technology and to advance to the ecological environment type. The combustion characteristics of bituminous coal and anthracite fired in Nanfang cement Plant of Chenzhou Hunan Province were studied and analyzed by means of industrial analyzer and thermogravimetric analyzer. The moisture, ash, volatilization, fixed carbon and ignition temperature of pulverized coal are measured. The combustion characteristics of anthracite were obtained by comparing and evaluating several bituminous coal and anthracite by using the ignition characteristic index, combustion intensity and combustion characteristic index of coal. When anthracite is burned in the calciner, the optimization of the structure and operation parameters of the calciner is theoretically guided, and the corresponding structural optimization and operation parameter optimization are made in order to obtain the high efficiency combustion of anthracite in the calciner. By using GAMBIT,FLUENT,ICEM and other fluid simulation software, the geometric model of 2500t/d calciner is established, and the mesh generation optimization and simulation are carried out. In the numerical simulation of Reynolds mean, the standard KG? Two-equation model and discrete phase (DPM) model are used to simulate gas-solid two-phase flow in calciner. The coupling of anthracite powder and carbonate decomposing in prototype calciner and decomposing furnace was simulated by using the component transport model combined with the (EDC) model of vortex dissipation concept. The velocity distribution of gas-solid two-phase flow, velocity distribution vector, particle trajectory and coupled temperature distribution of burning anthracite powder and carbonate decomposition were obtained by simulation. Volatilization distribution and component concentration distribution of related substances. The simulation results are compared with the actual test results, and the simulation results are in good agreement with the actual engineering results. On the basis of the simulation, the high efficiency combustion of total anthracite in calciner is simulated and optimized. By raising the position of raw material pipe, the injection of raw material can make the preheating ignition of anthracite have a relative combustion stable region, adjust the temperature of tertiary air, and accelerate the chemical dynamic reaction rate of coke. The pulverized coal particles can be distributed uniformly in the middle and lower part of the calciner and the heat transfer and combustion can be improved. When the height of raw coal injection pipe is 8.5 m, the third air temperature is 1223K, and the injection tube is four injection, the results of prototype calciner and staged combustion calciner are optimized. The burning rate of anthracite pulverized coal is 97.21% and 97.35%, and the decomposition rate of carbonate is 92.5% and 93.666% respectively. Furthermore, the combustor based on the prototype calciner is more favorable to anthracite combustion, carbonate decomposition and reduction of pollutant emissions, thus providing theoretical guidance for cement production.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ172.62
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